The only way that is possible is by working for summer or winter camps, as far as I know. Most places have hired for summer camps already as it can take a while to get the paperwork sorted out. Still may be worth checking the job boards specific to the countries you are interested in though.

Thanks for asking !
Korea is a mixed bag like anywhere else. It gets a bad rap on internet forums, however bad news is always more interesting to read about and talk about right? I have found that many people are in Korea getting on with their lives, enjoying it, meeting people, having fun, saving money, and, yes having bad days and bitching and moaning about it. Same- same. Just watch out for the taxi drivers . Realise it's a very different culture and country. Make an effort to make friends with people who may have different ideas and values to you. Get to know your boss and co-workers. Don't sweat the small stuff. Do your research.
Cheers,
Ruth
http://tefldaddy.com/Korea.htm